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Are Wells Geo-Located In Washington State ?
It seems the Seatle Big Digger “Big Bertha” has been hung up on an 8″ monitoring well pipe installed in 2002. That would have been geo-located in New Jersey and I do not know how many other states. Even a hand held GPS would have shown it close enough to the tunnel route to be a concern.
Though not strictly required in PA, every monitoring well I locate has been geo-located since I also use GPS for vertical datum.
Paul in PA
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